Process for production of biodiesel from high acid feed
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United States of America Patent
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Issued Date -
Nov 15, 2007
app pub date -
May 10, 2006
filing date -
May 10, 2006
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Abandoned
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Abstract
Biodiesel fuels are produced efficiently and at low cost from waste oil feeds containing high concentrations of fatty acids. By first producing an ester of a water immiscible alcohol, water of reaction from the esterification can be easily stripped out with and separated from the alcohol, which is recycled to the esterification reaction. Subsequent transesterification with glycerin produces a feed with a sufficiently low acid value to allow methanolysis using a basic catalyst to proceed rapidly without consumption of large quantities of catalyst or organic acid salt formation.
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